Drilling rigs are punching the last of 320 boreholes this summer on a full city block along the East River, where Lendlease is building a 789,000-sq-ft mixed-use complex of five buildings in Brooklyn’s Greenpoint neighborhood. While no one will see the 499-ft-deep holes when 1 Java Street opens in late 2025, they underpin the development’s signature feature as the largest residential geothermal system installed in New York state, and possibly in the U.S.